CAJ | 학술논문

用直接进样差量气相色谱法测定非甲烷总烃（NMHC）量。实验研究了分析条件、气源和定量方式等对NMHC定量准确度的影响。综合考虑较低基线响应和较高灵敏度等，选择合适的氢气和空气流速，测得NMHC方法检出限为0.03 mg/m3（以碳计），该法可保证低浓度样品分析的准确度。实验结果表明，标准气中CH4和C3H8遵从碳数响应规律，其配比不会影响定量的准确性，可根据样品总烃和甲烷比例适当配制；对于低浓度样品，以空气为底气的总烃响应灵敏度低于氮气为底气的总烃响应灵敏度，采用以氮气为底气的标准气来定量空气中总烃的含量时，测定结果将产生较大偏差，甚至可能产生负值，应该用以除烃空气为底气的标准气来定量空气样品；某些样品测定过程中，总烃不只出一个峰，需要调节相关条件再进行测定。
용직접진양차량기상색보법측정비갑완총경（NMHC）량。실험연구료분석조건、기원화정량방식등대NMHC정량준학도적영향。종합고필교저기선향응화교고령민도등，선택합괄적경기화공기류속，측득NMHC방법검출한위0.03 mg/m3（이탄계），해법가보증저농도양품분석적준학도。실험결과표명，표준기중CH4화C3H8준종탄수향응규률，기배비불회영향정량적준학성，가근거양품총경화갑완비례괄당배제；대우저농도양품，이공기위저기적총경향응령민도저우담기위저기적총경향응령민도，채용이담기위저기적표준기래정량공기중총경적함량시，측정결과장산생교대편차，심지가능산생부치，응해용이제경공기위저기적표준기래정량공기양품；모사양품측정과정중，총경불지출일개봉，수요조절상관조건재진행측정。
A method of determination of non-methane hydrocarbons(NMHC)in air by gas chromatography was established. The effects of analysis condition,gas supplies and quantification mode on quantification accuracy in the determination of NMHC by GC were studied. In the experiment,from overall consideration of lower baselines and higher sensitivities,suitable flow rate of H2 and air was selected and the method detection limit of NMHC was 0.03 mg/m3 (by carbon). From the results,it was found that CH4 and C3H8 comply with carbon number responses,the ratio of CH4 and C3H8 in the standard gases won’t affect quantification accuracy,and the ratio of CH4 and C3H8 in the standard gases can be determined by the ratio of total hydrocarbon and methane in the samples. About low concentration gases,the response sensitivity of total hydrocarbon in air was lower than that in nitrogen,so that if standard gases in nitrogen was used to quantify total hydrocarbon in air samples,it may produce large deviations,even negative values. Standard gases in air without hydrocarbon should be used to quantify total hydrocarbon in air samples. Total hydrocarbons responses of some samples may appear not only one peak,so that it needs to adjust some measurement conditions,and then measure them again.